Find the number that will come next in the following series.
20, 31, 44, 61, 80, 103, ?
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → 132
Look at the difference between each pair of terms. The differences are the prime numbers in order:
\(31-20=11\), \(44-31=13\)
\(61-44=17\), \(80-61=19\)
\(103-80=23\)
The next prime after 23 is 29, so the next term is \(103+29=132\).